Trinity desktop. When you open like firefox or writer, it hesitates a bit and makes you wonder did you click to open but when it starts to open it opens quite fast.

Haven't checked the ram, may check today

Latest smplayer deb from their website. Watched 720p.

Yes, no problems, yet I think better not to run in full hd. Maybe full works too but tried only in a place with a bad network.

Not sure about 3G cause haven't tried. But it's debian so should not be a problem to install any missing packages.